Add a package for cysystemd.

This package is a dependency of amd-debug-tools.

pkgs/development/python-modules/cysystemd/default.nix

@@ -0,0 +1,45 @@
+{
+  lib,
+  buildPythonPackage,
+  fetchgit,
+  pythonOlder,
+  cython,
+  pkg-config,
+  setuptools,
+  systemd,
+}:
+
+let
+  version = "1.6.3";
+in
+buildPythonPackage {
+  pname = "cysystemd";
+  version = version;
+  format = "pyproject";
+
+  src = fetchgit {
+    url = "https://github.com/mosquito/cysystemd.git";
+    tag = version;
+    sha256 = "sha256-xumrQgoKfFeKdRQUIYXXiXEcNd76i4wo/EIDm8BN7oU=";
+  };
+
+  disabled = pythonOlder "3.8";
+
+  build-system = [
+    setuptools
+    cython
+  ];
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ systemd ];
+
+  pythonImportsCheck = [ "cysystemd" ];
+
+  meta = with lib; {
+    description = "systemd wrapper on Cython";
+    homepage = "https://github.com/mosquito/cysystemd";
+    license = licenses.asl20;
+    platforms = platforms.linux;
+  };
+}

pkgs/top-level/python-packages.nix

@@ -3234,6 +3234,8 @@ self: super: with self; {
 
   cysignals = callPackage ../development/python-modules/cysignals { };
 
+  cysystemd = callPackage ../development/python-modules/cysystemd { };
+
   cython = callPackage ../development/python-modules/cython { };
 
   cython-test-exception-raiser =